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Use nearest_integer instructions to improve expf performance. Performance tests with CORE-MATH's perf tool: Before the patch: ``` $ ./perf.sh expm1f LIBC-location: /home/lnt/experiment/llvm/llvm-project/build/projects/libc/lib/libllvmlibc.a GNU libc version: 2.31 GNU libc release: stable CORE-MATH reciprocal throughput : 10.096 System LIBC reciprocal throughput : 44.036 LIBC reciprocal throughput : 11.575 $ ./perf.sh expm1f --latency LIBC-location: /home/lnt/experiment/llvm/llvm-project/build/projects/libc/lib/libllvmlibc.a GNU libc version: 2.31 GNU libc release: stable CORE-MATH latency : 42.239 System LIBC latency : 122.815 LIBC latency : 50.122 ``` After the patch: ``` $ ./perf.sh expm1f LIBC-location: /home/lnt/experiment/llvm/llvm-project/build/projects/libc/lib/libllvmlibc.a GNU libc version: 2.31 GNU libc release: stable CORE-MATH reciprocal throughput : 10.046 System LIBC reciprocal throughput : 43.899 LIBC reciprocal throughput : 9.179 $ ./perf.sh expm1f --latency LIBC-location: /home/lnt/experiment/llvm/llvm-project/build/projects/libc/lib/libllvmlibc.a GNU libc version: 2.31 GNU libc release: stable CORE-MATH latency : 42.078 System LIBC latency : 120.488 LIBC latency : 41.528 ``` Reviewed By: zimmermann6 Differential Revision: https://reviews.llvm.org/D130502
libc Documentation ================== The libc documentation is written using the Sphinx documentation generator. It is currently tested with Sphinx 1.1.3. To build the documents into html configure libc with the following cmake options: * -DLLVM_ENABLE_SPHINX=ON * -DLIBC_INCLUDE_DOCS=ON After configuring libc with these options the make rule `docs-libc-html` should be available.